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Vertebrates minus tetrapods.
This paraphyletic subgroup is easy to form the "acquatic only" (fishes) vs "things that come out of water" (tetrapods). Though mudfish make that distinction harder.
Which kind of makes sense, why would you want for limbs unless you are going to stay out of water!

Ancestors (13)

  1. Vertebrate
  2. Chordate subclade
  3. Chordate
  4. Animal subclade
  5. Animal
  6. Eukarya subclade
  7. Eukaryote
  8. Species
  9. Taxonomy
  10. Biology
  11. Natural science
  12. Science
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